Effect of noncircular orifice plates on the near flow field of turbulent free jets

doi:10.1088/1674-1056/23/12/124703

Abstract

In this paper, we experimentally investigate the near-field flow characteristics of turbulent free jets respectively issued from circular, triangular, diamond, rectangular, and notched-rectangular orifice plates into air surroundings. All the orifice plates have identical opening areas or equivalent diameters (D_e) and their aspect ratios (AR) range from 1 to 6.5. Planar particle image velocimetry (PIV) is used to measure the velocity field at the same Reynolds number of Re= 5×10⁴, where Re= U_eD_e/ν with U_e being the exit bulk velocity and ν the kinematic viscosity of fluid. The mean and turbulent velocity fields of all the five jets are compared in detail. Results show that the noncircular jets can enhance the entrainment rate, reflected by the higher acceleration rates of mean velocity decay and spread, shorten the length of the unmixed core, expedite the increase of turbulent intensity compared with the circular counterpart shortened unmixed core, and increase turbulent intensity comparing to the circular counterpart. Among the five jets, the rectangular jet (AR= 6.5) produces the greatest decay rate of the near-field mean velocity, postpones the position at which the 鈥榓xis-switching鈥檖phenomenon occurs. This supports that axis switching phenomenon strongly depends on jet initial conditions. In addition, the hump in the centerline variation of the turbulence intensity is observed in the rectangular and triangular jets, but not in the circular jet, nor in diamond jet nor in notched-rectangular jet.

Keywords: noncircular jet free jet turbulence mixing axis-switching

Received: 20 March 2014
Revised: 12 June 2014
Accepted manuscript online:

PACS:	47.27.wg	(Turbulent jets)
	47.80.Cb	(Velocity measurements)
	47.85.lk	(Mixing enhancement)

Fund:

Project supported by the Fundamental Research Funds for the Central Universities, China (Grant No. 3132014050), the General Science Research Project of the Education Department of Liaoning Province, China (Grant No. L2013198), the Natural Science Foundation of Liaoning Province, China (Grant No. L2014025012), and the National Natural Science Foundation of China (Grant Nos. 10921202 and 11072005).

Corresponding Authors: Xu Min-Yi
E-mail: xuminyi@dlmu.edu.cn

Cite this article:

Xu Min-Yi (徐敏义), Tong Xing-Qing (童杏清), Yue Dan-Ting (岳丹婷), Zhang Jian-Peng (张健鹏), Mi Jian-Chun (米建春), Nathan G. J., Kalt P. A. M. Effect of noncircular orifice plates on the near flow field of turbulent free jets 2014 Chin. Phys. B 23 124703


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